Homemade balancing
Homemade balancing
(OP)
Hello everyone,
We'll soon need to buy a balancer and a vibration analyser to run spindles up. But before to do that, I was wondering if someone knows an easy home made method to balance a spindle? Also, I'd like to know what would be the best quality/price system. I know I can have both the balancer and the analyser on the same device, is it reliable?
Thanks for your help,
We'll soon need to buy a balancer and a vibration analyser to run spindles up. But before to do that, I was wondering if someone knows an easy home made method to balance a spindle? Also, I'd like to know what would be the best quality/price system. I know I can have both the balancer and the analyser on the same device, is it reliable?
Thanks for your help,





RE: Homemade balancing
Parts are balanced to tolerance based on their speed and weight. Balance tolerance is expressed in force and distance. Oz-In, Gr-mm, Gr-In, what ever units you wish.
a part weighing 100lbs and spining at 4000rpm would be balanced as follows 100x6/4000=0.15 Oz-In or 4.25 Gr-in.
For parts which are symetrical and have 2 supporting planes divide these totals by 2. If your parts assymetrical or overhung use the bearing plane weight at each bearing for your calculations. Note these guys make the best balance machines http://www.schenck-usa.com/index.asp
RE: Homemade balancing
We built our own balancer to help get started many yrs ago.It worked OK till we found a perfect unit second hand, We still needed to buy the vibration analyser however. tell us more and we can advise. Cheers CM
RE: Homemade balancing
RE: Homemade balancing
This board does too, but you have to register.
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Modern spindle specifications include at least moderately detailed vibration analysis as part of acceptance testing. So, combined vibration analysis and balancing capabilities make a lot of sense.
A couple of acclerometers, a data acquisition board, software and a few more gizmos and you're in business.
RE: Homemade balancing
RE: Homemade balancing
From what I see on your needs, you need to get low tolerances this is required when you are working with high speeds you will need to be able to detect less than 1 gram inch of unbalance at low RPM. No easy task for the DIY.This guy has a Schenck listed on Surplus record etbalance@earthlink.net. Try your luck.
RE: Homemade balancing
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Depending on the operating speed of your spindles that chart will probably cause beads of sweat and furrows to appear on your brow. Special techniques to ensure repeatable centering will need to be instituted. It is not a trivial problem, and does not have simple solutions.
As a practical matter, if the roller diameter differs from the (perfect) journal diameter by at least 15% or so, the analyzer electronics can separate the 1X unbalance signal from bearing runout.
You may find that bushings have so much drag that a drive belt has a very tough time. End drives and precision balancing probably don't belong in the same sentence.
If you will be testing assembled spindles (and you should) you may need trim balance correction features at each end.
Many threaded holes for set screws makes a balancer smile.
RE: Homemade balancing
You would need to install a once-per-rev tacho pulse (white paint mark or reflective tape) amd measure 1X vibration amplitude and phase angle with a relatively simple analyser (single channel is OK).
You can balance at operating speed. This setup should be more than enough to get installed vibration down to just about any level you care to achieve (based on time available) and removes concerns about balancing machine bearings/supports.
The first few might take a little time to get just right so that you perfect your technique, but after a little practice, you should be able to balance quite quickly.
Whatever route you go down - keep it safe - there's a lot of potential for damage (personal and material) when balancing.
RE: Homemade balancing
RE: Homemade balancing